Inclined underfeed riveting machine with magnetic anvil



Oct. 7, 1952 G. B. CRANOR 2,613,009

INCLINED UNDERFEED RIVETING MACHINE WITH MAGNETIC ANVIL Filed Jan. 10, 1950 12 Q 70 52 62 la |4- 5o INVENTGR GFFORQ B CRANOR FIE-F Y M m Patented Oct. 7, 1952 INCLINED UNDERFEED RIVETING MACHINE WITHMAGNETIC ANVIL Gifford B. Cranor, Jackson, Mich., assignor to Tomkins-Johnson Company, Jackson, Mich., a

corporation 1 of Michigan Application January 10, 1950, Serial No. 137,830

2 Claims. (01. 218--2) 1 V Thisinvention relates to machines for upsetting upsettable members, such as clinch nuts, andparticularly to machines which incorporate a reciprocable anvil onto which the upsettable members are delivered from a feed transfer mechanism and delivered to an upsetting die.

An example of the machine to which the pres entinventi'on relates is somewhat fully disclosed in the priOrU. S. Patent No. 2,163,440 granted June 20, 1939. The machine as disclosed in this priorpatent is shownwith a casing part containing the reciprocable anvil onto which the upsettable members are fed seriatim from a feed transfer mechanism while traveling in horizontal lineformation. In the prior patent this casing part is shown as presenting a'front wall which is perpendicular to the horizontal and the existence of which wall imposes a limitation upon the extent to which a workpiece, to which it is desired to affix upsettable members, can be moved forward into position between theopened-up anvil and die.

With the modern trend in automotive design, however, and the adoption of the prior art machine to the affixing of clinch nuts, for instance to automotive fenders, for example, it happens that the existence of this perpendicular wall limits the use of the machine by preventing the fenders and other workpiece parts from being positioned sufficiently forward beneath the anvil, by appropriate'manipulation of an overhanging portion of the workpiece positioned between the opened-up anvil and die, to permit theaffixing of clinch nuts or the like over therequired surface area of the workpieces.

An object of the present invention is to overcome the above mentioned defect of theprior art machine, and of riveting and like machines moved farther across the opposed anvil and die. surfaces than would be otherwise possible.

It is also an object of the invention to provide a riveting or like machine in which the upsettable members are magnetically attracted onto the anvil for feeding against the associated die and generally so to improve and modify the anvil and associated casing structure that not only ,is it possible to feed the upsettable members in a more positive and controlled manner than is possible with the prior art machines, but curved and bent shaped workpieces are capable of being body there is mountedthe anvil ram [4,.this

2 l handled in the machine with the afilxing of upsettable members thereto over a greater surface area than has been hitherto possible. i i

The above and other objects and advantages of the invention will become clear from a consideration of the following description with reference to the accompanying drawings, in which:

Fi I is a fragmentary part vertical sectional view of the anvil and associated die of a riveting machine, showing the improved anvil construction with its magnetized supporting surface,

Fig. II is a detail view, in vertical section, showing the anvil ram with a. clinch nutvsupported thereon, and the action of the ram in pushing back the line of clinch nuts in the feed transfer mechanism, I l I Fig. III is a transverse section on the line AA of Fig. I,

Fig. IV is a transverse section on the line B--B of Fig. I, i

Fig. V is a perspective view of the rear plate of the anvil, having thev slot therein through which the clinch nuts are fed onto the anvil ram, and I.

Fig. VI is a perspective view of a clinch nut, such as can be handled by the present anvil construction, although the anvil construction can be adapted to handle other shapes and forms of upsettable members generally.

Referring to the drawings, 10 indicates the front casing portion of a riveting machine in which the anvil structure is mounted and which casing portion, to conform with present day requirements, is formed with a rearwardly inclined front face l2.

For a complete understanding of the general construction and operation of the riveting machine reference may be made to U. S. Patent No. 2,163,440, patented June 20, 1939. It is sufiicient to point out herein that the rearward inclination of. the front casing face I 2 gives rise to the necessity of employing a correspondingly inclined anvil structure if the anvil cam I4 is to deliver the upsettable members beneath the ,die, indicated generally at l6. L

Such an inclined mounting of the anvil structure is shown in Figs. I and II. I y J The anvil structure is-composed of the outer body l8, which is of channel section, as appears clear in Figs. III and IV, and. in which outer ram being reciprocable within the body [8 under the control of a toggle mechanism comprising the links 2|], 22 and the toggle actuator rod 24, pivotally connected with the links at 26.

The toggle link 22 is pivotally connected at its lower end about the fixed pivot 28 whereas the toggle link is pivotally connected at its upper end about a pivot 30 upon a block 32, which block is slidable within the casing portion In and is rigidly connected with the lower end of the anvil ram [4 bythe stud 34.

The anvil body 18 is adapted to be clamped into fixed position upon the front of the casing ID, as by the clamp housing 36, which, in effect, forms part of the machine casingandincludesthefront inclined wall surface I 2.

The anvil channel section body I8 is employed in conjunction with a separateplate .38, which closes the open side of the channel and'has -a. slot 40 therein through which the clinch nuts are fed onto the ram, as will be described later. The plate 38 also has screw holes'42, which receive screws 44 for attaching a plate 46 to the plate 38, the plate having a bent sprung lip portion 48, the uppere'dgeportion (if-which is disposed .to'ioe slightly in the pathrof the clinch nut supported upon the anvil mm, as and" for the. purp se to be described: later.

Theplate 38 is provided with .zside'recesses '50 in which pins 5'2on the fixed machine casing sides l0 engage to; prevent '-undue'upward movement of theJpJat beaadng in .mindithat the plate is held alampedagainst the edges of the casing sides Iii byithe.pressureapplied by the clamp housing -33 and "that "the, plate 38 :is subjected to theifriction sliding motion of the anvil ram 1 1. These recesses zl'aflxan'd 51131115 52; however, constitute merely a safety feature. in .case the :plate 133 should .abe

.movedcas stated and'whichis notlikely to happen in the general use of the machine.

Dealing'further with the anviliconstruction, an important feature of the present invention resides Itheprovision of the anvil ram 1'4 with a permanent magnet insert 54 in the formofta plug '.secured.in.5a.b0re 56 in the upper end of the-anvil iandzmachinefinished atiits upper endtO provide ,a .horizontalasurface .58 flush with the 'abounding horizontal surface portion 60 of the anvil. This surface portion 60 is of rectangular outline, as seen in :Eigs. III andlV, and' along its side remote :fnom the clinch nut'e'ntry slot 4!! is provide'dwith an upstanding 'shallow fiange E2 of a depth corresponding substantially'to the depth of the flange portion Mof'the-clinch' nut 66, (Fig. VI)

The .clinch nuts are fed to'the anvil in horiz-zontalline formationalo'ng a horizontal magazine =68, towhich theclinchnuts are delivered from an overhead hop-per and associated chute (not shown) and in such manner that the line of clinch nnts is constantly-urged forward.

In the operation of the anvil, when "theanvil ram 14 is in the lowered position as shown in ndottedlines in Fig." I, the anvil surface, con- \stitut'ed by the magnet surface 58 and the abounding'anvilsurface-60, is positioned in line with the line of clinch nuts .in the horizontal -magaz'ine BByas Well as opposite the slot All. A

'sclinchxnut fidis therefore pushed through the slot onto the anvil surface, being attracted thereto by: the magnet'M-and being properly located upon the anvil byabutting against the upstanding JI-he anvil vram isshown with a tapered front 4 clinch nut immediately behind the clinch nut on the anvil and cams the line of clinch nuts back along the magazine, as seen in Fig. II, thereby freeing the anvil ram to be lifted to position the clinch nut opposite the die I 6 for operation thereon to clinch the lifted nut onto the metal sheet l0, seen in Fig. I.

Upon being lifted to the top of the fixed anvil structure 58 the side of the clinch nut remote from the abutment flange B2 is lightly engaged by the free edge portion of the sprung portion 48 of the-plateMB-and' by the resulting spring action serves to retain the clinch nut properly located upon the anvil'forfthe desired clinching operation,

performed by therdie head 12.

' The invention provides an exceedingly useful and efiicient .anvil construction, with which upsettable members can be fed for upsetting in a positive and reliable manner, while enabling an inclined arrangement of the anvil and the associated front casing surface to beemployedwith theattendant advantagetha-tthe machine-is able and wish to secure by Letters Ratent-is-asfollows:

'1. In a machine for upsetting rivets and the like, fixed frame structure defining an upper horizontal surfacea-nd a front wall downwardly and reanwardly inclined from said surface; said-sur face supporting -a horizontal rivet feed magazine, said frame structure: havingzan elongated guide slot vertically .inclinedin.correspondingrrelation to Y said inclined front wall, a rivet feeding ram, means mounting said ram :for vertical reciprocation in:sai'd.'sl"ot t'o feed'the'rivet: against an upsetting :die, :said ram having 5a horizontal top surface withlan upstandin'giabutment 'atitlcie side thereof remote from a side opening'inzan upstanding wall ::portion :of. said frame'strncture through which said side opening a :rivet is :capabio of being fed from isaid ma'g'azzine onto said {ram surface, recess in said ram i-surfacefiand a 1 permanent v magnet mounted in .said' recess its upper end flush with said ramisurface said abutment serving fully to position arivet upon said ram surface.

2. A rivet upsetting machine :as claimed in 'claim l, said ram-presentin'g a bevelledisurfaceon the side thereof adjacent said side openingsaid bevelled surface being inclined downwardly-and rearwardly from said top ram surface, whereby the corresponding side of said surfaceis space fromsaid side opening.

GIFFORD CRAN'OR...

REFERENCES :CIZIED The following references 'areof record in the file of this patent:

UN ITED- STATES 

